/******************************************************************************
 *  Copyright 2015 by OLTPBenchmark Project                                   *
 *                                                                            *
 *  Licensed under the Apache License, Version 2.0 (the "License");           *
 *  you may not use this file except in compliance with the License.          *
 *  You may obtain a copy of the License at                                   *
 *                                                                            *
 *    http://www.apache.org/licenses/LICENSE-2.0                              *
 *                                                                            *
 *  Unless required by applicable law or agreed to in writing, software       *
 *  distributed under the License is distributed on an "AS IS" BASIS,         *
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  *
 *  See the License for the specific language governing permissions and       *
 *  limitations under the License.                                            *
 ******************************************************************************/

package com.oltpbenchmark.benchmarks.resourcestresser.procedures;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.oltpbenchmark.api.Procedure;
import com.oltpbenchmark.api.SQLStmt;
import com.oltpbenchmark.benchmarks.resourcestresser.ResourceStresserConstants;
import com.oltpbenchmark.benchmarks.resourcestresser.ResourceStresserWorker;

public class CPU2 extends Procedure {

    public final SQLStmt cpuSelect;
    { 
        String complexClause = "passwd";
        for (int i = 1; i <= ResourceStresserWorker.CPU2_nestedLevel; ++i) {
            complexClause = "md5(concat(" + complexClause +",?))";
        } // FOR
        cpuSelect = new SQLStmt(
            "SELECT count(*) FROM (SELECT " + complexClause + 
            " FROM " + ResourceStresserConstants.TABLENAME_CPUTABLE + 
            " WHERE empid >= 0 AND empid < 100) AS T2" 
        );
    }
    
    public void run(Connection conn, int howManyPerTransaction, int sleepLength,
    		int nestedLevel) throws SQLException {
        PreparedStatement stmt = this.getPreparedStatement(conn, cpuSelect);

        for (int tranIdx = 0; tranIdx < howManyPerTransaction; ++tranIdx) {
            double randNoise = ResourceStresserWorker.gen.nextDouble();

            for (int i = 1; i <= nestedLevel; ++i) {
                stmt.setString(i, Double.toString(randNoise));
            } // FOR

            // TODO: Is this the right place to sleep?  With rs open???
            ResultSet rs = stmt.executeQuery();
            try {
                Thread.sleep(sleepLength);
            } catch (InterruptedException e) {
                rs.close();
                throw new SQLException("Unexpected interupt while sleeping!");
            }
            rs.close();
        } // FOR
    }
    
}
